Hi sean,
I would leave well enough alone .
If you like what you have / simply enjoy them for what they offer .
FYI, GPA has dramatically changed ( according to their own spec sheets ) the ts parameters of their modern 416-8B variant .
- Their "modern" cone-kit may not work very well in an older magnetic structure ( such as your woofer represents ) .
- IOW, your 416-8b magnetics may not be up to the challenge of supporting the "heavier" modern GPA kits .
- Also, various threads ( over the years ) indicate that it's far from a slam-dunk to assume that GPA's regaussing service will restore the older magnetic structures to full strength ( & full spec ) .
GPA's most recent variant of the 416-8b has gotten very good ( to great ) reviews . You'd be best to simply buy them outright if you're that curious .
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PS : Why do you think your current cones are aftermarket ?